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A 14000 kg railroad car travels alone on a level frictionless track with a constant speed of 25.0 m/s. A 5250 kg load, initially at rest, is dropped onto the car. What will be the car's new speed?
A person's face is 30cm ini front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
A 3.00*10^2-eV electron and a 1.00*10^2-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
The frequncy doubled output of a laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532 nm in 3 minutes
Find the work done by an ideal engine which extracts 11500.0 J of heat from its hot reservoir while operating between 530.0 K and 310.0 K
q. the mass of a copper atom is 2.38 x 10-25 kg and the density of copper is 8 920 kgm3.a conclude the number of atoms
An x-ray tube is operated at 48200 V. Calculate the minimum wavelength of the radiation emitted by this tube
An infinitely long cylinder of radius R and linear charge densityλ has a potential on its surface of V0 volts. Usethe expression for the electric field of a uniformly charged cylinder to find the potential relative to the surface at a pointthat is di..
In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron
An engine operates between temperatures of 280 K and 700 K at 62.0 % of its maximum efficiency. how much work does the engine do
the four particles form a square of edge length a = 4.50 cm and have charges q1 = +25.0 nC, q2 = -50.0 nC, What net electric field do the particles produce at the square's center
If a car travelling at 63 km/h will skid 18 m when its brakes lock, how far will it skid if it is travelling at 150 km/h while its brakes lock.
a single-turn wire loop is 3.8cm in diameter and carries a 600ma current.part a find the magnetic field strength at the
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